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Complexation Equilibria: Factors Influencing Stability of Complexes01:09

Complexation Equilibria: Factors Influencing Stability of Complexes

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In complexation reactions, metal cations are the electron pair acceptors, and the ligands are the electron pair donors. The stability of the metal complexes depends primarily on the complexing ability of the central metal ion and the nature of the ligands. Generally, the complexing ability of the metal ion depends on the size and charge of the ion. As the metal ion size increases, the stability of the metal complexes decreases, provided that the valency of the metal ion and the ligands remain...
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Carbocations are one of the reaction intermediates formed during several nucleophilic substitutions or elimination reactions. A carbocation is an electron-deficient species with the central carbon atom having six electrons and three bonded atoms. The central carbon in a carbocation is sp2 hybridized with trigonal planar geometry. It has an empty p orbital perpendicular to the plane of the structure that can accept electrons. Thus, carbocations act as strong electrophiles and may react with any...
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EDTA titrations are usually carried out in highly basic conditions, where the fully deprotonated form of EDTA, Y4−, actively complexes with the free metal ions in the solution. Several metal ions precipitate as hydrous oxide (hydroxides, oxides, or oxyhydroxides) under these conditions, lowering the concentration of free metal ions in the solution. For this reason, auxiliary complexing agents or ligands such as ammonia, tartrate, citrate, or triethanolamine are used in EDTA titrations to...
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The presence of electron-donating, electron-withdrawing, or conjugating groups adjacent to a radical center, imparts electronic stabilization to the radicals. Examples of such electronically-stabilized radicals are triphenylmethyl, tetramethylpiperidine‐N‐oxide, and 2,2‐diphenyl‐1‐picrylhydrazyl. These radicals are remarkably stable and are known as persistent radicals. Some of the persistent radicals can even be isolated and purified.
Along with electronic...
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Ionic Bonding and Electron Transfer

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Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. Compounds composed of ions are called ionic compounds (or salts), and their constituent ions are held together by ionic bonds: electrostatic forces of attraction between oppositely charged cations and anions. 
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Isolating Free Carbenes, their Mixed Dimers and Organic Radicals
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Stable and Storable N(CF3 )2 Transfer Reagents.

Leon N Schneider1, Eva-Maria Tanzer Krauel2, Carl Deutsch3

  • 1Institut für nachhaltige Chemie & Katalyse mit Bor (ICB) Institut für Anorganische Chemie, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|May 12, 2021
PubMed
Summary
This summary is machine-generated.

New copper and silver complexes enable the stable transfer of the bis(trifluoromethyl)amino group, crucial for pharmaceuticals and materials. These reagents overcome scarcity, facilitating novel fluorinated compound synthesis.

Keywords:
N ligandsaminationcopperfluorinated ligandssilver

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Area of Science:

  • Organometallic Chemistry
  • Fluorine Chemistry
  • Synthetic Methodology

Background:

  • Fluorinated groups are vital in pharmaceuticals, agrochemicals, and materials science.
  • The bis(trifluoromethyl)amino group [N(CF3)2] offers unique stability and potential but lacks efficient transfer reagents.
  • Existing methods for introducing fluorinated groups are limited, hindering the synthesis of N(CF3)2-containing molecules.

Purpose of the Study:

  • To develop novel, stable reagents for transferring the bis(trifluoromethyl)amino group.
  • To demonstrate the utility of these reagents in synthesizing valuable fluorinated compounds.
  • To address the scarcity of reliable N(CF3)2 transfer agents.

Main Methods:

  • Synthesis of copper(I) and silver(I) bis(trifluoromethyl)amido complexes.
  • Stabilization of complexes using N- and P-donor ligands.
  • Application of synthesized complexes in nucleophilic substitution and Sandmeyer reactions.

Main Results:

  • Novel, air-stable Cu(I) and Ag(I) bis(trifluoromethyl)amido complexes were synthesized.
  • These complexes function effectively as bis(trifluoromethyl)amination reagents.
  • Successful synthesis of various benzylbis(trifluoromethyl)amines and 2-bis(trifluoromethyl)amino acetate, leading to N,N-bis(trifluoromethyl)glycine.

Conclusions:

  • The developed metal complexes represent a significant advancement in N(CF3)2 group transfer.
  • These stable reagents overcome previous limitations, enabling broader access to N(CF3)2-containing molecules.
  • The findings pave the way for new fluorinated pharmaceuticals, agrochemicals, and advanced materials.